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[PPPOL2TP]: Add CONFIG_INET Kconfig dependency.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / serial / mpsc.c
blob00924feaf621831caa46267ad8b9b278a48a8552
1 /*
2 * Generic driver for the MPSC (UART mode) on Marvell parts (e.g., GT64240,
3 * GT64260, MV64340, MV64360, GT96100, ... ).
4 *
5 * Author: Mark A. Greer <mgreer@mvista.com>
6 *
7 * Based on an old MPSC driver that was in the linuxppc tree. It appears to
8 * have been created by Chris Zankel (formerly of MontaVista) but there
9 * is no proper Copyright so I'm not sure. Apparently, parts were also
10 * taken from PPCBoot (now U-Boot). Also based on drivers/serial/8250.c
11 * by Russell King.
12 *
13 * 2004 (c) MontaVista, Software, Inc. This file is licensed under
14 * the terms of the GNU General Public License version 2. This program
15 * is licensed "as is" without any warranty of any kind, whether express
16 * or implied.
17 */
18 /*
19 * The MPSC interface is much like a typical network controller's interface.
20 * That is, you set up separate rings of descriptors for transmitting and
21 * receiving data. There is also a pool of buffers with (one buffer per
22 * descriptor) that incoming data are dma'd into or outgoing data are dma'd
23 * out of.
24 *
25 * The MPSC requires two other controllers to be able to work. The Baud Rate
26 * Generator (BRG) provides a clock at programmable frequencies which determines
27 * the baud rate. The Serial DMA Controller (SDMA) takes incoming data from the
28 * MPSC and DMA's it into memory or DMA's outgoing data and passes it to the
29 * MPSC. It is actually the SDMA interrupt that the driver uses to keep the
30 * transmit and receive "engines" going (i.e., indicate data has been
31 * transmitted or received).
32 *
33 * NOTES:
34 *
35 * 1) Some chips have an erratum where several regs cannot be
36 * read. To work around that, we keep a local copy of those regs in
37 * 'mpsc_port_info'.
38 *
39 * 2) Some chips have an erratum where the ctlr will hang when the SDMA ctlr
40 * accesses system mem with coherency enabled. For that reason, the driver
41 * assumes that coherency for that ctlr has been disabled. This means
42 * that when in a cache coherent system, the driver has to manually manage
43 * the data cache on the areas that it touches because the dma_* macro are
44 * basically no-ops.
45 *
46 * 3) There is an erratum (on PPC) where you can't use the instruction to do
47 * a DMA_TO_DEVICE/cache clean so DMA_BIDIRECTIONAL/flushes are used in places
48 * where a DMA_TO_DEVICE/clean would have [otherwise] sufficed.
49 *
50 * 4) AFAICT, hardware flow control isn't supported by the controller --MAG.
51 */
52
53
54 #if defined(CONFIG_SERIAL_MPSC_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
55 #define SUPPORT_SYSRQ
56 #endif
57
58 #include <linux/module.h>
59 #include <linux/moduleparam.h>
60 #include <linux/tty.h>
61 #include <linux/tty_flip.h>
62 #include <linux/ioport.h>
63 #include <linux/init.h>
64 #include <linux/console.h>
65 #include <linux/sysrq.h>
66 #include <linux/serial.h>
67 #include <linux/serial_core.h>
68 #include <linux/delay.h>
69 #include <linux/device.h>
70 #include <linux/dma-mapping.h>
71 #include <linux/mv643xx.h>
72 #include <linux/platform_device.h>
73
74 #include <asm/io.h>
75 #include <asm/irq.h>
76
77 #if defined(CONFIG_SERIAL_MPSC_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
78 #define SUPPORT_SYSRQ
79 #endif
80
81 #define MPSC_NUM_CTLRS 2
82
83 /*
84 * Descriptors and buffers must be cache line aligned.
85 * Buffers lengths must be multiple of cache line size.
86 * Number of Tx & Rx descriptors must be powers of 2.
87 */
88 #define MPSC_RXR_ENTRIES 32
89 #define MPSC_RXRE_SIZE dma_get_cache_alignment()
90 #define MPSC_RXR_SIZE (MPSC_RXR_ENTRIES * MPSC_RXRE_SIZE)
91 #define MPSC_RXBE_SIZE dma_get_cache_alignment()
92 #define MPSC_RXB_SIZE (MPSC_RXR_ENTRIES * MPSC_RXBE_SIZE)
93
94 #define MPSC_TXR_ENTRIES 32
95 #define MPSC_TXRE_SIZE dma_get_cache_alignment()
96 #define MPSC_TXR_SIZE (MPSC_TXR_ENTRIES * MPSC_TXRE_SIZE)
97 #define MPSC_TXBE_SIZE dma_get_cache_alignment()
98 #define MPSC_TXB_SIZE (MPSC_TXR_ENTRIES * MPSC_TXBE_SIZE)
99
100 #define MPSC_DMA_ALLOC_SIZE (MPSC_RXR_SIZE + MPSC_RXB_SIZE + \
101 MPSC_TXR_SIZE + MPSC_TXB_SIZE + \
102 dma_get_cache_alignment() /* for alignment */)
103
104 /* Rx and Tx Ring entry descriptors -- assume entry size is <= cacheline size */
105 struct mpsc_rx_desc {
106 u16 bufsize;
107 u16 bytecnt;
108 u32 cmdstat;
109 u32 link;
110 u32 buf_ptr;
111 } __attribute((packed));
112
113 struct mpsc_tx_desc {
114 u16 bytecnt;
115 u16 shadow;
116 u32 cmdstat;
117 u32 link;
118 u32 buf_ptr;
119 } __attribute((packed));
120
121 /*
122 * Some regs that have the erratum that you can't read them are are shared
123 * between the two MPSC controllers. This struct contains those shared regs.
124 */
125 struct mpsc_shared_regs {
126 phys_addr_t mpsc_routing_base_p;
127 phys_addr_t sdma_intr_base_p;
128
129 void __iomem *mpsc_routing_base;
130 void __iomem *sdma_intr_base;
131
132 u32 MPSC_MRR_m;
133 u32 MPSC_RCRR_m;
134 u32 MPSC_TCRR_m;
135 u32 SDMA_INTR_CAUSE_m;
136 u32 SDMA_INTR_MASK_m;
137 };
138
139 /* The main driver data structure */
140 struct mpsc_port_info {
141 struct uart_port port; /* Overlay uart_port structure */
142
143 /* Internal driver state for this ctlr */
144 u8 ready;
145 u8 rcv_data;
146 tcflag_t c_iflag; /* save termios->c_iflag */
147 tcflag_t c_cflag; /* save termios->c_cflag */
148
149 /* Info passed in from platform */
150 u8 mirror_regs; /* Need to mirror regs? */
151 u8 cache_mgmt; /* Need manual cache mgmt? */
152 u8 brg_can_tune; /* BRG has baud tuning? */
153 u32 brg_clk_src;
154 u16 mpsc_max_idle;
155 int default_baud;
156 int default_bits;
157 int default_parity;
158 int default_flow;
159
160 /* Physical addresses of various blocks of registers (from platform) */
161 phys_addr_t mpsc_base_p;
162 phys_addr_t sdma_base_p;
163 phys_addr_t brg_base_p;
164
165 /* Virtual addresses of various blocks of registers (from platform) */
166 void __iomem *mpsc_base;
167 void __iomem *sdma_base;
168 void __iomem *brg_base;
169
170 /* Descriptor ring and buffer allocations */
171 void *dma_region;
172 dma_addr_t dma_region_p;
173
174 dma_addr_t rxr; /* Rx descriptor ring */
175 dma_addr_t rxr_p; /* Phys addr of rxr */
176 u8 *rxb; /* Rx Ring I/O buf */
177 u8 *rxb_p; /* Phys addr of rxb */
178 u32 rxr_posn; /* First desc w/ Rx data */
179
180 dma_addr_t txr; /* Tx descriptor ring */
181 dma_addr_t txr_p; /* Phys addr of txr */
182 u8 *txb; /* Tx Ring I/O buf */
183 u8 *txb_p; /* Phys addr of txb */
184 int txr_head; /* Where new data goes */
185 int txr_tail; /* Where sent data comes off */
186 spinlock_t tx_lock; /* transmit lock */
187
188 /* Mirrored values of regs we can't read (if 'mirror_regs' set) */
189 u32 MPSC_MPCR_m;
190 u32 MPSC_CHR_1_m;
191 u32 MPSC_CHR_2_m;
192 u32 MPSC_CHR_10_m;
193 u32 BRG_BCR_m;
194 struct mpsc_shared_regs *shared_regs;
195 };
196
197 /* Hooks to platform-specific code */
198 int mpsc_platform_register_driver(void);
199 void mpsc_platform_unregister_driver(void);
200
201 /* Hooks back in to mpsc common to be called by platform-specific code */
202 struct mpsc_port_info *mpsc_device_probe(int index);
203 struct mpsc_port_info *mpsc_device_remove(int index);
204
205 /* Main MPSC Configuration Register Offsets */
206 #define MPSC_MMCRL 0x0000
207 #define MPSC_MMCRH 0x0004
208 #define MPSC_MPCR 0x0008
209 #define MPSC_CHR_1 0x000c
210 #define MPSC_CHR_2 0x0010
211 #define MPSC_CHR_3 0x0014
212 #define MPSC_CHR_4 0x0018
213 #define MPSC_CHR_5 0x001c
214 #define MPSC_CHR_6 0x0020
215 #define MPSC_CHR_7 0x0024
216 #define MPSC_CHR_8 0x0028
217 #define MPSC_CHR_9 0x002c
218 #define MPSC_CHR_10 0x0030
219 #define MPSC_CHR_11 0x0034
220
221 #define MPSC_MPCR_FRZ (1 << 9)
222 #define MPSC_MPCR_CL_5 0
223 #define MPSC_MPCR_CL_6 1
224 #define MPSC_MPCR_CL_7 2
225 #define MPSC_MPCR_CL_8 3
226 #define MPSC_MPCR_SBL_1 0
227 #define MPSC_MPCR_SBL_2 1
228
229 #define MPSC_CHR_2_TEV (1<<1)
230 #define MPSC_CHR_2_TA (1<<7)
231 #define MPSC_CHR_2_TTCS (1<<9)
232 #define MPSC_CHR_2_REV (1<<17)
233 #define MPSC_CHR_2_RA (1<<23)
234 #define MPSC_CHR_2_CRD (1<<25)
235 #define MPSC_CHR_2_EH (1<<31)
236 #define MPSC_CHR_2_PAR_ODD 0
237 #define MPSC_CHR_2_PAR_SPACE 1
238 #define MPSC_CHR_2_PAR_EVEN 2
239 #define MPSC_CHR_2_PAR_MARK 3
240
241 /* MPSC Signal Routing */
242 #define MPSC_MRR 0x0000
243 #define MPSC_RCRR 0x0004
244 #define MPSC_TCRR 0x0008
245
246 /* Serial DMA Controller Interface Registers */
247 #define SDMA_SDC 0x0000
248 #define SDMA_SDCM 0x0008
249 #define SDMA_RX_DESC 0x0800
250 #define SDMA_RX_BUF_PTR 0x0808
251 #define SDMA_SCRDP 0x0810
252 #define SDMA_TX_DESC 0x0c00
253 #define SDMA_SCTDP 0x0c10
254 #define SDMA_SFTDP 0x0c14
255
256 #define SDMA_DESC_CMDSTAT_PE (1<<0)
257 #define SDMA_DESC_CMDSTAT_CDL (1<<1)
258 #define SDMA_DESC_CMDSTAT_FR (1<<3)
259 #define SDMA_DESC_CMDSTAT_OR (1<<6)
260 #define SDMA_DESC_CMDSTAT_BR (1<<9)
261 #define SDMA_DESC_CMDSTAT_MI (1<<10)
262 #define SDMA_DESC_CMDSTAT_A (1<<11)
263 #define SDMA_DESC_CMDSTAT_AM (1<<12)
264 #define SDMA_DESC_CMDSTAT_CT (1<<13)
265 #define SDMA_DESC_CMDSTAT_C (1<<14)
266 #define SDMA_DESC_CMDSTAT_ES (1<<15)
267 #define SDMA_DESC_CMDSTAT_L (1<<16)
268 #define SDMA_DESC_CMDSTAT_F (1<<17)
269 #define SDMA_DESC_CMDSTAT_P (1<<18)
270 #define SDMA_DESC_CMDSTAT_EI (1<<23)
271 #define SDMA_DESC_CMDSTAT_O (1<<31)
272
273 #define SDMA_DESC_DFLT (SDMA_DESC_CMDSTAT_O | \
274 SDMA_DESC_CMDSTAT_EI)
275
276 #define SDMA_SDC_RFT (1<<0)
277 #define SDMA_SDC_SFM (1<<1)
278 #define SDMA_SDC_BLMR (1<<6)
279 #define SDMA_SDC_BLMT (1<<7)
280 #define SDMA_SDC_POVR (1<<8)
281 #define SDMA_SDC_RIFB (1<<9)
282
283 #define SDMA_SDCM_ERD (1<<7)
284 #define SDMA_SDCM_AR (1<<15)
285 #define SDMA_SDCM_STD (1<<16)
286 #define SDMA_SDCM_TXD (1<<23)
287 #define SDMA_SDCM_AT (1<<31)
288
289 #define SDMA_0_CAUSE_RXBUF (1<<0)
290 #define SDMA_0_CAUSE_RXERR (1<<1)
291 #define SDMA_0_CAUSE_TXBUF (1<<2)
292 #define SDMA_0_CAUSE_TXEND (1<<3)
293 #define SDMA_1_CAUSE_RXBUF (1<<8)
294 #define SDMA_1_CAUSE_RXERR (1<<9)
295 #define SDMA_1_CAUSE_TXBUF (1<<10)
296 #define SDMA_1_CAUSE_TXEND (1<<11)
297
298 #define SDMA_CAUSE_RX_MASK (SDMA_0_CAUSE_RXBUF | SDMA_0_CAUSE_RXERR | \
299 SDMA_1_CAUSE_RXBUF | SDMA_1_CAUSE_RXERR)
300 #define SDMA_CAUSE_TX_MASK (SDMA_0_CAUSE_TXBUF | SDMA_0_CAUSE_TXEND | \
301 SDMA_1_CAUSE_TXBUF | SDMA_1_CAUSE_TXEND)
302
303 /* SDMA Interrupt registers */
304 #define SDMA_INTR_CAUSE 0x0000
305 #define SDMA_INTR_MASK 0x0080
306
307 /* Baud Rate Generator Interface Registers */
308 #define BRG_BCR 0x0000
309 #define BRG_BTR 0x0004
310
311 /*
312 * Define how this driver is known to the outside (we've been assigned a
313 * range on the "Low-density serial ports" major).
314 */
315 #define MPSC_MAJOR 204
316 #define MPSC_MINOR_START 44
317 #define MPSC_DRIVER_NAME "MPSC"
318 #define MPSC_DEV_NAME "ttyMM"
319 #define MPSC_VERSION "1.00"
320
321 static struct mpsc_port_info mpsc_ports[MPSC_NUM_CTLRS];
322 static struct mpsc_shared_regs mpsc_shared_regs;
323 static struct uart_driver mpsc_reg;
324
325 static void mpsc_start_rx(struct mpsc_port_info *pi);
326 static void mpsc_free_ring_mem(struct mpsc_port_info *pi);
327 static void mpsc_release_port(struct uart_port *port);
328 /*
329 ******************************************************************************
330 *
331 * Baud Rate Generator Routines (BRG)
332 *
333 ******************************************************************************
334 */
335 static void
336 mpsc_brg_init(struct mpsc_port_info *pi, u32 clk_src)
337 {
338 u32 v;
339
340 v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
341 v = (v & ~(0xf << 18)) | ((clk_src & 0xf) << 18);
342
343 if (pi->brg_can_tune)
344 v &= ~(1 << 25);
345
346 if (pi->mirror_regs)
347 pi->BRG_BCR_m = v;
348 writel(v, pi->brg_base + BRG_BCR);
349
350 writel(readl(pi->brg_base + BRG_BTR) & 0xffff0000,
351 pi->brg_base + BRG_BTR);
352 return;
353 }
354
355 static void
356 mpsc_brg_enable(struct mpsc_port_info *pi)
357 {
358 u32 v;
359
360 v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
361 v |= (1 << 16);
362
363 if (pi->mirror_regs)
364 pi->BRG_BCR_m = v;
365 writel(v, pi->brg_base + BRG_BCR);
366 return;
367 }
368
369 static void
370 mpsc_brg_disable(struct mpsc_port_info *pi)
371 {
372 u32 v;
373
374 v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
375 v &= ~(1 << 16);
376
377 if (pi->mirror_regs)
378 pi->BRG_BCR_m = v;
379 writel(v, pi->brg_base + BRG_BCR);
380 return;
381 }
382
383 static inline void
384 mpsc_set_baudrate(struct mpsc_port_info *pi, u32 baud)
385 {
386 /*
387 * To set the baud, we adjust the CDV field in the BRG_BCR reg.
388 * From manual: Baud = clk / ((CDV+1)*2) ==> CDV = (clk / (baud*2)) - 1.
389 * However, the input clock is divided by 16 in the MPSC b/c of how
390 * 'MPSC_MMCRH' was set up so we have to divide the 'clk' used in our
391 * calculation by 16 to account for that. So the real calculation
392 * that accounts for the way the mpsc is set up is:
393 * CDV = (clk / (baud*2*16)) - 1 ==> CDV = (clk / (baud << 5)) - 1.
394 */
395 u32 cdv = (pi->port.uartclk / (baud << 5)) - 1;
396 u32 v;
397
398 mpsc_brg_disable(pi);
399 v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
400 v = (v & 0xffff0000) | (cdv & 0xffff);
401
402 if (pi->mirror_regs)
403 pi->BRG_BCR_m = v;
404 writel(v, pi->brg_base + BRG_BCR);
405 mpsc_brg_enable(pi);
406
407 return;
408 }
409
410 /*
411 ******************************************************************************
412 *
413 * Serial DMA Routines (SDMA)
414 *
415 ******************************************************************************
416 */
417
418 static void
419 mpsc_sdma_burstsize(struct mpsc_port_info *pi, u32 burst_size)
420 {
421 u32 v;
422
423 pr_debug("mpsc_sdma_burstsize[%d]: burst_size: %d\n",
424 pi->port.line, burst_size);
425
426 burst_size >>= 3; /* Divide by 8 b/c reg values are 8-byte chunks */
427
428 if (burst_size < 2)
429 v = 0x0; /* 1 64-bit word */
430 else if (burst_size < 4)
431 v = 0x1; /* 2 64-bit words */
432 else if (burst_size < 8)
433 v = 0x2; /* 4 64-bit words */
434 else
435 v = 0x3; /* 8 64-bit words */
436
437 writel((readl(pi->sdma_base + SDMA_SDC) & (0x3 << 12)) | (v << 12),
438 pi->sdma_base + SDMA_SDC);
439 return;
440 }
441
442 static void
443 mpsc_sdma_init(struct mpsc_port_info *pi, u32 burst_size)
444 {
445 pr_debug("mpsc_sdma_init[%d]: burst_size: %d\n", pi->port.line,
446 burst_size);
447
448 writel((readl(pi->sdma_base + SDMA_SDC) & 0x3ff) | 0x03f,
449 pi->sdma_base + SDMA_SDC);
450 mpsc_sdma_burstsize(pi, burst_size);
451 return;
452 }
453
454 static inline u32
455 mpsc_sdma_intr_mask(struct mpsc_port_info *pi, u32 mask)
456 {
457 u32 old, v;
458
459 pr_debug("mpsc_sdma_intr_mask[%d]: mask: 0x%x\n", pi->port.line, mask);
460
461 old = v = (pi->mirror_regs) ? pi->shared_regs->SDMA_INTR_MASK_m :
462 readl(pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
463
464 mask &= 0xf;
465 if (pi->port.line)
466 mask <<= 8;
467 v &= ~mask;
468
469 if (pi->mirror_regs)
470 pi->shared_regs->SDMA_INTR_MASK_m = v;
471 writel(v, pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
472
473 if (pi->port.line)
474 old >>= 8;
475 return old & 0xf;
476 }
477
478 static inline void
479 mpsc_sdma_intr_unmask(struct mpsc_port_info *pi, u32 mask)
480 {
481 u32 v;
482
483 pr_debug("mpsc_sdma_intr_unmask[%d]: mask: 0x%x\n", pi->port.line,mask);
484
485 v = (pi->mirror_regs) ? pi->shared_regs->SDMA_INTR_MASK_m :
486 readl(pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
487
488 mask &= 0xf;
489 if (pi->port.line)
490 mask <<= 8;
491 v |= mask;
492
493 if (pi->mirror_regs)
494 pi->shared_regs->SDMA_INTR_MASK_m = v;
495 writel(v, pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
496 return;
497 }
498
499 static inline void
500 mpsc_sdma_intr_ack(struct mpsc_port_info *pi)
501 {
502 pr_debug("mpsc_sdma_intr_ack[%d]: Acknowledging IRQ\n", pi->port.line);
503
504 if (pi->mirror_regs)
505 pi->shared_regs->SDMA_INTR_CAUSE_m = 0;
506 writeb(0x00, pi->shared_regs->sdma_intr_base + SDMA_INTR_CAUSE +
507 pi->port.line);
508 return;
509 }
510
511 static inline void
512 mpsc_sdma_set_rx_ring(struct mpsc_port_info *pi, struct mpsc_rx_desc *rxre_p)
513 {
514 pr_debug("mpsc_sdma_set_rx_ring[%d]: rxre_p: 0x%x\n",
515 pi->port.line, (u32) rxre_p);
516
517 writel((u32)rxre_p, pi->sdma_base + SDMA_SCRDP);
518 return;
519 }
520
521 static inline void
522 mpsc_sdma_set_tx_ring(struct mpsc_port_info *pi, struct mpsc_tx_desc *txre_p)
523 {
524 writel((u32)txre_p, pi->sdma_base + SDMA_SFTDP);
525 writel((u32)txre_p, pi->sdma_base + SDMA_SCTDP);
526 return;
527 }
528
529 static inline void
530 mpsc_sdma_cmd(struct mpsc_port_info *pi, u32 val)
531 {
532 u32 v;
533
534 v = readl(pi->sdma_base + SDMA_SDCM);
535 if (val)
536 v |= val;
537 else
538 v = 0;
539 wmb();
540 writel(v, pi->sdma_base + SDMA_SDCM);
541 wmb();
542 return;
543 }
544
545 static inline uint
546 mpsc_sdma_tx_active(struct mpsc_port_info *pi)
547 {
548 return readl(pi->sdma_base + SDMA_SDCM) & SDMA_SDCM_TXD;
549 }
550
551 static inline void
552 mpsc_sdma_start_tx(struct mpsc_port_info *pi)
553 {
554 struct mpsc_tx_desc *txre, *txre_p;
555
556 /* If tx isn't running & there's a desc ready to go, start it */
557 if (!mpsc_sdma_tx_active(pi)) {
558 txre = (struct mpsc_tx_desc *)(pi->txr +
559 (pi->txr_tail * MPSC_TXRE_SIZE));
560 dma_cache_sync(pi->port.dev, (void *) txre, MPSC_TXRE_SIZE, DMA_FROM_DEVICE);
561 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
562 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
563 invalidate_dcache_range((ulong)txre,
564 (ulong)txre + MPSC_TXRE_SIZE);
565 #endif
566
567 if (be32_to_cpu(txre->cmdstat) & SDMA_DESC_CMDSTAT_O) {
568 txre_p = (struct mpsc_tx_desc *)(pi->txr_p +
569 (pi->txr_tail *
570 MPSC_TXRE_SIZE));
571
572 mpsc_sdma_set_tx_ring(pi, txre_p);
573 mpsc_sdma_cmd(pi, SDMA_SDCM_STD | SDMA_SDCM_TXD);
574 }
575 }
576
577 return;
578 }
579
580 static inline void
581 mpsc_sdma_stop(struct mpsc_port_info *pi)
582 {
583 pr_debug("mpsc_sdma_stop[%d]: Stopping SDMA\n", pi->port.line);
584
585 /* Abort any SDMA transfers */
586 mpsc_sdma_cmd(pi, 0);
587 mpsc_sdma_cmd(pi, SDMA_SDCM_AR | SDMA_SDCM_AT);
588
589 /* Clear the SDMA current and first TX and RX pointers */
590 mpsc_sdma_set_tx_ring(pi, NULL);
591 mpsc_sdma_set_rx_ring(pi, NULL);
592
593 /* Disable interrupts */
594 mpsc_sdma_intr_mask(pi, 0xf);
595 mpsc_sdma_intr_ack(pi);
596
597 return;
598 }
599
600 /*
601 ******************************************************************************
602 *
603 * Multi-Protocol Serial Controller Routines (MPSC)
604 *
605 ******************************************************************************
606 */
607
608 static void
609 mpsc_hw_init(struct mpsc_port_info *pi)
610 {
611 u32 v;
612
613 pr_debug("mpsc_hw_init[%d]: Initializing hardware\n", pi->port.line);
614
615 /* Set up clock routing */
616 if (pi->mirror_regs) {
617 v = pi->shared_regs->MPSC_MRR_m;
618 v &= ~0x1c7;
619 pi->shared_regs->MPSC_MRR_m = v;
620 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_MRR);
621
622 v = pi->shared_regs->MPSC_RCRR_m;
623 v = (v & ~0xf0f) | 0x100;
624 pi->shared_regs->MPSC_RCRR_m = v;
625 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_RCRR);
626
627 v = pi->shared_regs->MPSC_TCRR_m;
628 v = (v & ~0xf0f) | 0x100;
629 pi->shared_regs->MPSC_TCRR_m = v;
630 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_TCRR);
631 }
632 else {
633 v = readl(pi->shared_regs->mpsc_routing_base + MPSC_MRR);
634 v &= ~0x1c7;
635 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_MRR);
636
637 v = readl(pi->shared_regs->mpsc_routing_base + MPSC_RCRR);
638 v = (v & ~0xf0f) | 0x100;
639 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_RCRR);
640
641 v = readl(pi->shared_regs->mpsc_routing_base + MPSC_TCRR);
642 v = (v & ~0xf0f) | 0x100;
643 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_TCRR);
644 }
645
646 /* Put MPSC in UART mode & enabel Tx/Rx egines */
647 writel(0x000004c4, pi->mpsc_base + MPSC_MMCRL);
648
649 /* No preamble, 16x divider, low-latency, */
650 writel(0x04400400, pi->mpsc_base + MPSC_MMCRH);
651
652 if (pi->mirror_regs) {
653 pi->MPSC_CHR_1_m = 0;
654 pi->MPSC_CHR_2_m = 0;
655 }
656 writel(0, pi->mpsc_base + MPSC_CHR_1);
657 writel(0, pi->mpsc_base + MPSC_CHR_2);
658 writel(pi->mpsc_max_idle, pi->mpsc_base + MPSC_CHR_3);
659 writel(0, pi->mpsc_base + MPSC_CHR_4);
660 writel(0, pi->mpsc_base + MPSC_CHR_5);
661 writel(0, pi->mpsc_base + MPSC_CHR_6);
662 writel(0, pi->mpsc_base + MPSC_CHR_7);
663 writel(0, pi->mpsc_base + MPSC_CHR_8);
664 writel(0, pi->mpsc_base + MPSC_CHR_9);
665 writel(0, pi->mpsc_base + MPSC_CHR_10);
666
667 return;
668 }
669
670 static inline void
671 mpsc_enter_hunt(struct mpsc_port_info *pi)
672 {
673 pr_debug("mpsc_enter_hunt[%d]: Hunting...\n", pi->port.line);
674
675 if (pi->mirror_regs) {
676 writel(pi->MPSC_CHR_2_m | MPSC_CHR_2_EH,
677 pi->mpsc_base + MPSC_CHR_2);
678 /* Erratum prevents reading CHR_2 so just delay for a while */
679 udelay(100);
680 }
681 else {
682 writel(readl(pi->mpsc_base + MPSC_CHR_2) | MPSC_CHR_2_EH,
683 pi->mpsc_base + MPSC_CHR_2);
684
685 while (readl(pi->mpsc_base + MPSC_CHR_2) & MPSC_CHR_2_EH)
686 udelay(10);
687 }
688
689 return;
690 }
691
692 static inline void
693 mpsc_freeze(struct mpsc_port_info *pi)
694 {
695 u32 v;
696
697 pr_debug("mpsc_freeze[%d]: Freezing\n", pi->port.line);
698
699 v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
700 readl(pi->mpsc_base + MPSC_MPCR);
701 v |= MPSC_MPCR_FRZ;
702
703 if (pi->mirror_regs)
704 pi->MPSC_MPCR_m = v;
705 writel(v, pi->mpsc_base + MPSC_MPCR);
706 return;
707 }
708
709 static inline void
710 mpsc_unfreeze(struct mpsc_port_info *pi)
711 {
712 u32 v;
713
714 v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
715 readl(pi->mpsc_base + MPSC_MPCR);
716 v &= ~MPSC_MPCR_FRZ;
717
718 if (pi->mirror_regs)
719 pi->MPSC_MPCR_m = v;
720 writel(v, pi->mpsc_base + MPSC_MPCR);
721
722 pr_debug("mpsc_unfreeze[%d]: Unfrozen\n", pi->port.line);
723 return;
724 }
725
726 static inline void
727 mpsc_set_char_length(struct mpsc_port_info *pi, u32 len)
728 {
729 u32 v;
730
731 pr_debug("mpsc_set_char_length[%d]: char len: %d\n", pi->port.line,len);
732
733 v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
734 readl(pi->mpsc_base + MPSC_MPCR);
735 v = (v & ~(0x3 << 12)) | ((len & 0x3) << 12);
736
737 if (pi->mirror_regs)
738 pi->MPSC_MPCR_m = v;
739 writel(v, pi->mpsc_base + MPSC_MPCR);
740 return;
741 }
742
743 static inline void
744 mpsc_set_stop_bit_length(struct mpsc_port_info *pi, u32 len)
745 {
746 u32 v;
747
748 pr_debug("mpsc_set_stop_bit_length[%d]: stop bits: %d\n",
749 pi->port.line, len);
750
751 v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
752 readl(pi->mpsc_base + MPSC_MPCR);
753
754 v = (v & ~(1 << 14)) | ((len & 0x1) << 14);
755
756 if (pi->mirror_regs)
757 pi->MPSC_MPCR_m = v;
758 writel(v, pi->mpsc_base + MPSC_MPCR);
759 return;
760 }
761
762 static inline void
763 mpsc_set_parity(struct mpsc_port_info *pi, u32 p)
764 {
765 u32 v;
766
767 pr_debug("mpsc_set_parity[%d]: parity bits: 0x%x\n", pi->port.line, p);
768
769 v = (pi->mirror_regs) ? pi->MPSC_CHR_2_m :
770 readl(pi->mpsc_base + MPSC_CHR_2);
771
772 p &= 0x3;
773 v = (v & ~0xc000c) | (p << 18) | (p << 2);
774
775 if (pi->mirror_regs)
776 pi->MPSC_CHR_2_m = v;
777 writel(v, pi->mpsc_base + MPSC_CHR_2);
778 return;
779 }
780
781 /*
782 ******************************************************************************
783 *
784 * Driver Init Routines
785 *
786 ******************************************************************************
787 */
788
789 static void
790 mpsc_init_hw(struct mpsc_port_info *pi)
791 {
792 pr_debug("mpsc_init_hw[%d]: Initializing\n", pi->port.line);
793
794 mpsc_brg_init(pi, pi->brg_clk_src);
795 mpsc_brg_enable(pi);
796 mpsc_sdma_init(pi, dma_get_cache_alignment()); /* burst a cacheline */
797 mpsc_sdma_stop(pi);
798 mpsc_hw_init(pi);
799
800 return;
801 }
802
803 static int
804 mpsc_alloc_ring_mem(struct mpsc_port_info *pi)
805 {
806 int rc = 0;
807
808 pr_debug("mpsc_alloc_ring_mem[%d]: Allocating ring mem\n",
809 pi->port.line);
810
811 if (!pi->dma_region) {
812 if (!dma_supported(pi->port.dev, 0xffffffff)) {
813 printk(KERN_ERR "MPSC: Inadequate DMA support\n");
814 rc = -ENXIO;
815 }
816 else if ((pi->dma_region = dma_alloc_noncoherent(pi->port.dev,
817 MPSC_DMA_ALLOC_SIZE, &pi->dma_region_p, GFP_KERNEL))
818 == NULL) {
819
820 printk(KERN_ERR "MPSC: Can't alloc Desc region\n");
821 rc = -ENOMEM;
822 }
823 }
824
825 return rc;
826 }
827
828 static void
829 mpsc_free_ring_mem(struct mpsc_port_info *pi)
830 {
831 pr_debug("mpsc_free_ring_mem[%d]: Freeing ring mem\n", pi->port.line);
832
833 if (pi->dma_region) {
834 dma_free_noncoherent(pi->port.dev, MPSC_DMA_ALLOC_SIZE,
835 pi->dma_region, pi->dma_region_p);
836 pi->dma_region = NULL;
837 pi->dma_region_p = (dma_addr_t) NULL;
838 }
839
840 return;
841 }
842
843 static void
844 mpsc_init_rings(struct mpsc_port_info *pi)
845 {
846 struct mpsc_rx_desc *rxre;
847 struct mpsc_tx_desc *txre;
848 dma_addr_t dp, dp_p;
849 u8 *bp, *bp_p;
850 int i;
851
852 pr_debug("mpsc_init_rings[%d]: Initializing rings\n", pi->port.line);
853
854 BUG_ON(pi->dma_region == NULL);
855
856 memset(pi->dma_region, 0, MPSC_DMA_ALLOC_SIZE);
857
858 /*
859 * Descriptors & buffers are multiples of cacheline size and must be
860 * cacheline aligned.
861 */
862 dp = ALIGN((u32) pi->dma_region, dma_get_cache_alignment());
863 dp_p = ALIGN((u32) pi->dma_region_p, dma_get_cache_alignment());
864
865 /*
866 * Partition dma region into rx ring descriptor, rx buffers,
867 * tx ring descriptors, and tx buffers.
868 */
869 pi->rxr = dp;
870 pi->rxr_p = dp_p;
871 dp += MPSC_RXR_SIZE;
872 dp_p += MPSC_RXR_SIZE;
873
874 pi->rxb = (u8 *) dp;
875 pi->rxb_p = (u8 *) dp_p;
876 dp += MPSC_RXB_SIZE;
877 dp_p += MPSC_RXB_SIZE;
878
879 pi->rxr_posn = 0;
880
881 pi->txr = dp;
882 pi->txr_p = dp_p;
883 dp += MPSC_TXR_SIZE;
884 dp_p += MPSC_TXR_SIZE;
885
886 pi->txb = (u8 *) dp;
887 pi->txb_p = (u8 *) dp_p;
888
889 pi->txr_head = 0;
890 pi->txr_tail = 0;
891
892 /* Init rx ring descriptors */
893 dp = pi->rxr;
894 dp_p = pi->rxr_p;
895 bp = pi->rxb;
896 bp_p = pi->rxb_p;
897
898 for (i = 0; i < MPSC_RXR_ENTRIES; i++) {
899 rxre = (struct mpsc_rx_desc *)dp;
900
901 rxre->bufsize = cpu_to_be16(MPSC_RXBE_SIZE);
902 rxre->bytecnt = cpu_to_be16(0);
903 rxre->cmdstat = cpu_to_be32(SDMA_DESC_CMDSTAT_O |
904 SDMA_DESC_CMDSTAT_EI |
905 SDMA_DESC_CMDSTAT_F |
906 SDMA_DESC_CMDSTAT_L);
907 rxre->link = cpu_to_be32(dp_p + MPSC_RXRE_SIZE);
908 rxre->buf_ptr = cpu_to_be32(bp_p);
909
910 dp += MPSC_RXRE_SIZE;
911 dp_p += MPSC_RXRE_SIZE;
912 bp += MPSC_RXBE_SIZE;
913 bp_p += MPSC_RXBE_SIZE;
914 }
915 rxre->link = cpu_to_be32(pi->rxr_p); /* Wrap last back to first */
916
917 /* Init tx ring descriptors */
918 dp = pi->txr;
919 dp_p = pi->txr_p;
920 bp = pi->txb;
921 bp_p = pi->txb_p;
922
923 for (i = 0; i < MPSC_TXR_ENTRIES; i++) {
924 txre = (struct mpsc_tx_desc *)dp;
925
926 txre->link = cpu_to_be32(dp_p + MPSC_TXRE_SIZE);
927 txre->buf_ptr = cpu_to_be32(bp_p);
928
929 dp += MPSC_TXRE_SIZE;
930 dp_p += MPSC_TXRE_SIZE;
931 bp += MPSC_TXBE_SIZE;
932 bp_p += MPSC_TXBE_SIZE;
933 }
934 txre->link = cpu_to_be32(pi->txr_p); /* Wrap last back to first */
935
936 dma_cache_sync(pi->port.dev, (void *) pi->dma_region, MPSC_DMA_ALLOC_SIZE,
937 DMA_BIDIRECTIONAL);
938 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
939 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
940 flush_dcache_range((ulong)pi->dma_region,
941 (ulong)pi->dma_region + MPSC_DMA_ALLOC_SIZE);
942 #endif
943
944 return;
945 }
946
947 static void
948 mpsc_uninit_rings(struct mpsc_port_info *pi)
949 {
950 pr_debug("mpsc_uninit_rings[%d]: Uninitializing rings\n",pi->port.line);
951
952 BUG_ON(pi->dma_region == NULL);
953
954 pi->rxr = 0;
955 pi->rxr_p = 0;
956 pi->rxb = NULL;
957 pi->rxb_p = NULL;
958 pi->rxr_posn = 0;
959
960 pi->txr = 0;
961 pi->txr_p = 0;
962 pi->txb = NULL;
963 pi->txb_p = NULL;
964 pi->txr_head = 0;
965 pi->txr_tail = 0;
966
967 return;
968 }
969
970 static int
971 mpsc_make_ready(struct mpsc_port_info *pi)
972 {
973 int rc;
974
975 pr_debug("mpsc_make_ready[%d]: Making cltr ready\n", pi->port.line);
976
977 if (!pi->ready) {
978 mpsc_init_hw(pi);
979 if ((rc = mpsc_alloc_ring_mem(pi)))
980 return rc;
981 mpsc_init_rings(pi);
982 pi->ready = 1;
983 }
984
985 return 0;
986 }
987
988 /*
989 ******************************************************************************
990 *
991 * Interrupt Handling Routines
992 *
993 ******************************************************************************
994 */
995
996 static inline int
997 mpsc_rx_intr(struct mpsc_port_info *pi)
998 {
999 struct mpsc_rx_desc *rxre;
1000 struct tty_struct *tty = pi->port.info->tty;
1001 u32 cmdstat, bytes_in, i;
1002 int rc = 0;
1003 u8 *bp;
1004 char flag = TTY_NORMAL;
1005
1006 pr_debug("mpsc_rx_intr[%d]: Handling Rx intr\n", pi->port.line);
1007
1008 rxre = (struct mpsc_rx_desc *)(pi->rxr + (pi->rxr_posn*MPSC_RXRE_SIZE));
1009
1010 dma_cache_sync(pi->port.dev, (void *)rxre, MPSC_RXRE_SIZE, DMA_FROM_DEVICE);
1011 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1012 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1013 invalidate_dcache_range((ulong)rxre,
1014 (ulong)rxre + MPSC_RXRE_SIZE);
1015 #endif
1016
1017 /*
1018 * Loop through Rx descriptors handling ones that have been completed.
1019 */
1020 while (!((cmdstat = be32_to_cpu(rxre->cmdstat)) & SDMA_DESC_CMDSTAT_O)){
1021 bytes_in = be16_to_cpu(rxre->bytecnt);
1022
1023 /* Following use of tty struct directly is deprecated */
1024 if (unlikely(tty_buffer_request_room(tty, bytes_in) < bytes_in)) {
1025 if (tty->low_latency)
1026 tty_flip_buffer_push(tty);
1027 /*
1028 * If this failed then we will throw away the bytes
1029 * but must do so to clear interrupts.
1030 */
1031 }
1032
1033 bp = pi->rxb + (pi->rxr_posn * MPSC_RXBE_SIZE);
1034 dma_cache_sync(pi->port.dev, (void *) bp, MPSC_RXBE_SIZE, DMA_FROM_DEVICE);
1035 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1036 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1037 invalidate_dcache_range((ulong)bp,
1038 (ulong)bp + MPSC_RXBE_SIZE);
1039 #endif
1040
1041 /*
1042 * Other than for parity error, the manual provides little
1043 * info on what data will be in a frame flagged by any of
1044 * these errors. For parity error, it is the last byte in
1045 * the buffer that had the error. As for the rest, I guess
1046 * we'll assume there is no data in the buffer.
1047 * If there is...it gets lost.
1048 */
1049 if (unlikely(cmdstat & (SDMA_DESC_CMDSTAT_BR |
1050 SDMA_DESC_CMDSTAT_FR | SDMA_DESC_CMDSTAT_OR))) {
1051
1052 pi->port.icount.rx++;
1053
1054 if (cmdstat & SDMA_DESC_CMDSTAT_BR) { /* Break */
1055 pi->port.icount.brk++;
1056
1057 if (uart_handle_break(&pi->port))
1058 goto next_frame;
1059 }
1060 else if (cmdstat & SDMA_DESC_CMDSTAT_FR)/* Framing */
1061 pi->port.icount.frame++;
1062 else if (cmdstat & SDMA_DESC_CMDSTAT_OR) /* Overrun */
1063 pi->port.icount.overrun++;
1064
1065 cmdstat &= pi->port.read_status_mask;
1066
1067 if (cmdstat & SDMA_DESC_CMDSTAT_BR)
1068 flag = TTY_BREAK;
1069 else if (cmdstat & SDMA_DESC_CMDSTAT_FR)
1070 flag = TTY_FRAME;
1071 else if (cmdstat & SDMA_DESC_CMDSTAT_OR)
1072 flag = TTY_OVERRUN;
1073 else if (cmdstat & SDMA_DESC_CMDSTAT_PE)
1074 flag = TTY_PARITY;
1075 }
1076
1077 if (uart_handle_sysrq_char(&pi->port, *bp)) {
1078 bp++;
1079 bytes_in--;
1080 goto next_frame;
1081 }
1082
1083 if ((unlikely(cmdstat & (SDMA_DESC_CMDSTAT_BR |
1084 SDMA_DESC_CMDSTAT_FR | SDMA_DESC_CMDSTAT_OR))) &&
1085 !(cmdstat & pi->port.ignore_status_mask))
1086
1087 tty_insert_flip_char(tty, *bp, flag);
1088 else {
1089 for (i=0; i<bytes_in; i++)
1090 tty_insert_flip_char(tty, *bp++, TTY_NORMAL);
1091
1092 pi->port.icount.rx += bytes_in;
1093 }
1094
1095 next_frame:
1096 rxre->bytecnt = cpu_to_be16(0);
1097 wmb();
1098 rxre->cmdstat = cpu_to_be32(SDMA_DESC_CMDSTAT_O |
1099 SDMA_DESC_CMDSTAT_EI |
1100 SDMA_DESC_CMDSTAT_F |
1101 SDMA_DESC_CMDSTAT_L);
1102 wmb();
1103 dma_cache_sync(pi->port.dev, (void *)rxre, MPSC_RXRE_SIZE, DMA_BIDIRECTIONAL);
1104 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1105 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1106 flush_dcache_range((ulong)rxre,
1107 (ulong)rxre + MPSC_RXRE_SIZE);
1108 #endif
1109
1110 /* Advance to next descriptor */
1111 pi->rxr_posn = (pi->rxr_posn + 1) & (MPSC_RXR_ENTRIES - 1);
1112 rxre = (struct mpsc_rx_desc *)(pi->rxr +
1113 (pi->rxr_posn * MPSC_RXRE_SIZE));
1114 dma_cache_sync(pi->port.dev, (void *)rxre, MPSC_RXRE_SIZE, DMA_FROM_DEVICE);
1115 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1116 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1117 invalidate_dcache_range((ulong)rxre,
1118 (ulong)rxre + MPSC_RXRE_SIZE);
1119 #endif
1120
1121 rc = 1;
1122 }
1123
1124 /* Restart rx engine, if its stopped */
1125 if ((readl(pi->sdma_base + SDMA_SDCM) & SDMA_SDCM_ERD) == 0)
1126 mpsc_start_rx(pi);
1127
1128 tty_flip_buffer_push(tty);
1129 return rc;
1130 }
1131
1132 static inline void
1133 mpsc_setup_tx_desc(struct mpsc_port_info *pi, u32 count, u32 intr)
1134 {
1135 struct mpsc_tx_desc *txre;
1136
1137 txre = (struct mpsc_tx_desc *)(pi->txr +
1138 (pi->txr_head * MPSC_TXRE_SIZE));
1139
1140 txre->bytecnt = cpu_to_be16(count);
1141 txre->shadow = txre->bytecnt;
1142 wmb(); /* ensure cmdstat is last field updated */
1143 txre->cmdstat = cpu_to_be32(SDMA_DESC_CMDSTAT_O | SDMA_DESC_CMDSTAT_F |
1144 SDMA_DESC_CMDSTAT_L | ((intr) ?
1145 SDMA_DESC_CMDSTAT_EI
1146 : 0));
1147 wmb();
1148 dma_cache_sync(pi->port.dev, (void *) txre, MPSC_TXRE_SIZE, DMA_BIDIRECTIONAL);
1149 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1150 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1151 flush_dcache_range((ulong)txre,
1152 (ulong)txre + MPSC_TXRE_SIZE);
1153 #endif
1154
1155 return;
1156 }
1157
1158 static inline void
1159 mpsc_copy_tx_data(struct mpsc_port_info *pi)
1160 {
1161 struct circ_buf *xmit = &pi->port.info->xmit;
1162 u8 *bp;
1163 u32 i;
1164
1165 /* Make sure the desc ring isn't full */
1166 while (CIRC_CNT(pi->txr_head, pi->txr_tail, MPSC_TXR_ENTRIES) <
1167 (MPSC_TXR_ENTRIES - 1)) {
1168 if (pi->port.x_char) {
1169 /*
1170 * Ideally, we should use the TCS field in
1171 * CHR_1 to put the x_char out immediately but
1172 * errata prevents us from being able to read
1173 * CHR_2 to know that its safe to write to
1174 * CHR_1. Instead, just put it in-band with
1175 * all the other Tx data.
1176 */
1177 bp = pi->txb + (pi->txr_head * MPSC_TXBE_SIZE);
1178 *bp = pi->port.x_char;
1179 pi->port.x_char = 0;
1180 i = 1;
1181 }
1182 else if (!uart_circ_empty(xmit) && !uart_tx_stopped(&pi->port)){
1183 i = min((u32) MPSC_TXBE_SIZE,
1184 (u32) uart_circ_chars_pending(xmit));
1185 i = min(i, (u32) CIRC_CNT_TO_END(xmit->head, xmit->tail,
1186 UART_XMIT_SIZE));
1187 bp = pi->txb + (pi->txr_head * MPSC_TXBE_SIZE);
1188 memcpy(bp, &xmit->buf[xmit->tail], i);
1189 xmit->tail = (xmit->tail + i) & (UART_XMIT_SIZE - 1);
1190
1191 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
1192 uart_write_wakeup(&pi->port);
1193 }
1194 else /* All tx data copied into ring bufs */
1195 return;
1196
1197 dma_cache_sync(pi->port.dev, (void *) bp, MPSC_TXBE_SIZE, DMA_BIDIRECTIONAL);
1198 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1199 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1200 flush_dcache_range((ulong)bp,
1201 (ulong)bp + MPSC_TXBE_SIZE);
1202 #endif
1203 mpsc_setup_tx_desc(pi, i, 1);
1204
1205 /* Advance to next descriptor */
1206 pi->txr_head = (pi->txr_head + 1) & (MPSC_TXR_ENTRIES - 1);
1207 }
1208
1209 return;
1210 }
1211
1212 static inline int
1213 mpsc_tx_intr(struct mpsc_port_info *pi)
1214 {
1215 struct mpsc_tx_desc *txre;
1216 int rc = 0;
1217 unsigned long iflags;
1218
1219 spin_lock_irqsave(&pi->tx_lock, iflags);
1220
1221 if (!mpsc_sdma_tx_active(pi)) {
1222 txre = (struct mpsc_tx_desc *)(pi->txr +
1223 (pi->txr_tail * MPSC_TXRE_SIZE));
1224
1225 dma_cache_sync(pi->port.dev, (void *) txre, MPSC_TXRE_SIZE, DMA_FROM_DEVICE);
1226 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1227 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1228 invalidate_dcache_range((ulong)txre,
1229 (ulong)txre + MPSC_TXRE_SIZE);
1230 #endif
1231
1232 while (!(be32_to_cpu(txre->cmdstat) & SDMA_DESC_CMDSTAT_O)) {
1233 rc = 1;
1234 pi->port.icount.tx += be16_to_cpu(txre->bytecnt);
1235 pi->txr_tail = (pi->txr_tail+1) & (MPSC_TXR_ENTRIES-1);
1236
1237 /* If no more data to tx, fall out of loop */
1238 if (pi->txr_head == pi->txr_tail)
1239 break;
1240
1241 txre = (struct mpsc_tx_desc *)(pi->txr +
1242 (pi->txr_tail * MPSC_TXRE_SIZE));
1243 dma_cache_sync(pi->port.dev, (void *) txre, MPSC_TXRE_SIZE,
1244 DMA_FROM_DEVICE);
1245 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1246 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1247 invalidate_dcache_range((ulong)txre,
1248 (ulong)txre + MPSC_TXRE_SIZE);
1249 #endif
1250 }
1251
1252 mpsc_copy_tx_data(pi);
1253 mpsc_sdma_start_tx(pi); /* start next desc if ready */
1254 }
1255
1256 spin_unlock_irqrestore(&pi->tx_lock, iflags);
1257 return rc;
1258 }
1259
1260 /*
1261 * This is the driver's interrupt handler. To avoid a race, we first clear
1262 * the interrupt, then handle any completed Rx/Tx descriptors. When done
1263 * handling those descriptors, we restart the Rx/Tx engines if they're stopped.
1264 */
1265 static irqreturn_t
1266 mpsc_sdma_intr(int irq, void *dev_id)
1267 {
1268 struct mpsc_port_info *pi = dev_id;
1269 ulong iflags;
1270 int rc = IRQ_NONE;
1271
1272 pr_debug("mpsc_sdma_intr[%d]: SDMA Interrupt Received\n",pi->port.line);
1273
1274 spin_lock_irqsave(&pi->port.lock, iflags);
1275 mpsc_sdma_intr_ack(pi);
1276 if (mpsc_rx_intr(pi))
1277 rc = IRQ_HANDLED;
1278 if (mpsc_tx_intr(pi))
1279 rc = IRQ_HANDLED;
1280 spin_unlock_irqrestore(&pi->port.lock, iflags);
1281
1282 pr_debug("mpsc_sdma_intr[%d]: SDMA Interrupt Handled\n", pi->port.line);
1283 return rc;
1284 }
1285
1286 /*
1287 ******************************************************************************
1288 *
1289 * serial_core.c Interface routines
1290 *
1291 ******************************************************************************
1292 */
1293 static uint
1294 mpsc_tx_empty(struct uart_port *port)
1295 {
1296 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1297 ulong iflags;
1298 uint rc;
1299
1300 spin_lock_irqsave(&pi->port.lock, iflags);
1301 rc = mpsc_sdma_tx_active(pi) ? 0 : TIOCSER_TEMT;
1302 spin_unlock_irqrestore(&pi->port.lock, iflags);
1303
1304 return rc;
1305 }
1306
1307 static void
1308 mpsc_set_mctrl(struct uart_port *port, uint mctrl)
1309 {
1310 /* Have no way to set modem control lines AFAICT */
1311 return;
1312 }
1313
1314 static uint
1315 mpsc_get_mctrl(struct uart_port *port)
1316 {
1317 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1318 u32 mflags, status;
1319
1320 status = (pi->mirror_regs) ? pi->MPSC_CHR_10_m :
1321 readl(pi->mpsc_base + MPSC_CHR_10);
1322
1323 mflags = 0;
1324 if (status & 0x1)
1325 mflags |= TIOCM_CTS;
1326 if (status & 0x2)
1327 mflags |= TIOCM_CAR;
1328
1329 return mflags | TIOCM_DSR; /* No way to tell if DSR asserted */
1330 }
1331
1332 static void
1333 mpsc_stop_tx(struct uart_port *port)
1334 {
1335 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1336
1337 pr_debug("mpsc_stop_tx[%d]\n", port->line);
1338
1339 mpsc_freeze(pi);
1340 return;
1341 }
1342
1343 static void
1344 mpsc_start_tx(struct uart_port *port)
1345 {
1346 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1347 unsigned long iflags;
1348
1349 spin_lock_irqsave(&pi->tx_lock, iflags);
1350
1351 mpsc_unfreeze(pi);
1352 mpsc_copy_tx_data(pi);
1353 mpsc_sdma_start_tx(pi);
1354
1355 spin_unlock_irqrestore(&pi->tx_lock, iflags);
1356
1357 pr_debug("mpsc_start_tx[%d]\n", port->line);
1358 return;
1359 }
1360
1361 static void
1362 mpsc_start_rx(struct mpsc_port_info *pi)
1363 {
1364 pr_debug("mpsc_start_rx[%d]: Starting...\n", pi->port.line);
1365
1366 /* Issue a Receive Abort to clear any receive errors */
1367 writel(MPSC_CHR_2_RA, pi->mpsc_base + MPSC_CHR_2);
1368 if (pi->rcv_data) {
1369 mpsc_enter_hunt(pi);
1370 mpsc_sdma_cmd(pi, SDMA_SDCM_ERD);
1371 }
1372 return;
1373 }
1374
1375 static void
1376 mpsc_stop_rx(struct uart_port *port)
1377 {
1378 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1379
1380 pr_debug("mpsc_stop_rx[%d]: Stopping...\n", port->line);
1381
1382 mpsc_sdma_cmd(pi, SDMA_SDCM_AR);
1383 return;
1384 }
1385
1386 static void
1387 mpsc_enable_ms(struct uart_port *port)
1388 {
1389 return; /* Not supported */
1390 }
1391
1392 static void
1393 mpsc_break_ctl(struct uart_port *port, int ctl)
1394 {
1395 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1396 ulong flags;
1397 u32 v;
1398
1399 v = ctl ? 0x00ff0000 : 0;
1400
1401 spin_lock_irqsave(&pi->port.lock, flags);
1402 if (pi->mirror_regs)
1403 pi->MPSC_CHR_1_m = v;
1404 writel(v, pi->mpsc_base + MPSC_CHR_1);
1405 spin_unlock_irqrestore(&pi->port.lock, flags);
1406
1407 return;
1408 }
1409
1410 static int
1411 mpsc_startup(struct uart_port *port)
1412 {
1413 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1414 u32 flag = 0;
1415 int rc;
1416
1417 pr_debug("mpsc_startup[%d]: Starting up MPSC, irq: %d\n",
1418 port->line, pi->port.irq);
1419
1420 if ((rc = mpsc_make_ready(pi)) == 0) {
1421 /* Setup IRQ handler */
1422 mpsc_sdma_intr_ack(pi);
1423
1424 /* If irq's are shared, need to set flag */
1425 if (mpsc_ports[0].port.irq == mpsc_ports[1].port.irq)
1426 flag = IRQF_SHARED;
1427
1428 if (request_irq(pi->port.irq, mpsc_sdma_intr, flag,
1429 "mpsc-sdma", pi))
1430 printk(KERN_ERR "MPSC: Can't get SDMA IRQ %d\n",
1431 pi->port.irq);
1432
1433 mpsc_sdma_intr_unmask(pi, 0xf);
1434 mpsc_sdma_set_rx_ring(pi, (struct mpsc_rx_desc *)(pi->rxr_p +
1435 (pi->rxr_posn * MPSC_RXRE_SIZE)));
1436 }
1437
1438 return rc;
1439 }
1440
1441 static void
1442 mpsc_shutdown(struct uart_port *port)
1443 {
1444 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1445
1446 pr_debug("mpsc_shutdown[%d]: Shutting down MPSC\n", port->line);
1447
1448 mpsc_sdma_stop(pi);
1449 free_irq(pi->port.irq, pi);
1450 return;
1451 }
1452
1453 static void
1454 mpsc_set_termios(struct uart_port *port, struct ktermios *termios,
1455 struct ktermios *old)
1456 {
1457 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1458 u32 baud;
1459 ulong flags;
1460 u32 chr_bits, stop_bits, par;
1461
1462 pi->c_iflag = termios->c_iflag;
1463 pi->c_cflag = termios->c_cflag;
1464
1465 switch (termios->c_cflag & CSIZE) {
1466 case CS5:
1467 chr_bits = MPSC_MPCR_CL_5;
1468 break;
1469 case CS6:
1470 chr_bits = MPSC_MPCR_CL_6;
1471 break;
1472 case CS7:
1473 chr_bits = MPSC_MPCR_CL_7;
1474 break;
1475 case CS8:
1476 default:
1477 chr_bits = MPSC_MPCR_CL_8;
1478 break;
1479 }
1480
1481 if (termios->c_cflag & CSTOPB)
1482 stop_bits = MPSC_MPCR_SBL_2;
1483 else
1484 stop_bits = MPSC_MPCR_SBL_1;
1485
1486 par = MPSC_CHR_2_PAR_EVEN;
1487 if (termios->c_cflag & PARENB)
1488 if (termios->c_cflag & PARODD)
1489 par = MPSC_CHR_2_PAR_ODD;
1490 #ifdef CMSPAR
1491 if (termios->c_cflag & CMSPAR) {
1492 if (termios->c_cflag & PARODD)
1493 par = MPSC_CHR_2_PAR_MARK;
1494 else
1495 par = MPSC_CHR_2_PAR_SPACE;
1496 }
1497 #endif
1498
1499 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk);
1500
1501 spin_lock_irqsave(&pi->port.lock, flags);
1502
1503 uart_update_timeout(port, termios->c_cflag, baud);
1504
1505 mpsc_set_char_length(pi, chr_bits);
1506 mpsc_set_stop_bit_length(pi, stop_bits);
1507 mpsc_set_parity(pi, par);
1508 mpsc_set_baudrate(pi, baud);
1509
1510 /* Characters/events to read */
1511 pi->rcv_data = 1;
1512 pi->port.read_status_mask = SDMA_DESC_CMDSTAT_OR;
1513
1514 if (termios->c_iflag & INPCK)
1515 pi->port.read_status_mask |= SDMA_DESC_CMDSTAT_PE |
1516 SDMA_DESC_CMDSTAT_FR;
1517
1518 if (termios->c_iflag & (BRKINT | PARMRK))
1519 pi->port.read_status_mask |= SDMA_DESC_CMDSTAT_BR;
1520
1521 /* Characters/events to ignore */
1522 pi->port.ignore_status_mask = 0;
1523
1524 if (termios->c_iflag & IGNPAR)
1525 pi->port.ignore_status_mask |= SDMA_DESC_CMDSTAT_PE |
1526 SDMA_DESC_CMDSTAT_FR;
1527
1528 if (termios->c_iflag & IGNBRK) {
1529 pi->port.ignore_status_mask |= SDMA_DESC_CMDSTAT_BR;
1530
1531 if (termios->c_iflag & IGNPAR)
1532 pi->port.ignore_status_mask |= SDMA_DESC_CMDSTAT_OR;
1533 }
1534
1535 /* Ignore all chars if CREAD not set */
1536 if (!(termios->c_cflag & CREAD))
1537 pi->rcv_data = 0;
1538 else
1539 mpsc_start_rx(pi);
1540
1541 spin_unlock_irqrestore(&pi->port.lock, flags);
1542 return;
1543 }
1544
1545 static const char *
1546 mpsc_type(struct uart_port *port)
1547 {
1548 pr_debug("mpsc_type[%d]: port type: %s\n", port->line,MPSC_DRIVER_NAME);
1549 return MPSC_DRIVER_NAME;
1550 }
1551
1552 static int
1553 mpsc_request_port(struct uart_port *port)
1554 {
1555 /* Should make chip/platform specific call */
1556 return 0;
1557 }
1558
1559 static void
1560 mpsc_release_port(struct uart_port *port)
1561 {
1562 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1563
1564 if (pi->ready) {
1565 mpsc_uninit_rings(pi);
1566 mpsc_free_ring_mem(pi);
1567 pi->ready = 0;
1568 }
1569
1570 return;
1571 }
1572
1573 static void
1574 mpsc_config_port(struct uart_port *port, int flags)
1575 {
1576 return;
1577 }
1578
1579 static int
1580 mpsc_verify_port(struct uart_port *port, struct serial_struct *ser)
1581 {
1582 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1583 int rc = 0;
1584
1585 pr_debug("mpsc_verify_port[%d]: Verifying port data\n", pi->port.line);
1586
1587 if (ser->type != PORT_UNKNOWN && ser->type != PORT_MPSC)
1588 rc = -EINVAL;
1589 else if (pi->port.irq != ser->irq)
1590 rc = -EINVAL;
1591 else if (ser->io_type != SERIAL_IO_MEM)
1592 rc = -EINVAL;
1593 else if (pi->port.uartclk / 16 != ser->baud_base) /* Not sure */
1594 rc = -EINVAL;
1595 else if ((void *)pi->port.mapbase != ser->iomem_base)
1596 rc = -EINVAL;
1597 else if (pi->port.iobase != ser->port)
1598 rc = -EINVAL;
1599 else if (ser->hub6 != 0)
1600 rc = -EINVAL;
1601
1602 return rc;
1603 }
1604
1605 static struct uart_ops mpsc_pops = {
1606 .tx_empty = mpsc_tx_empty,
1607 .set_mctrl = mpsc_set_mctrl,
1608 .get_mctrl = mpsc_get_mctrl,
1609 .stop_tx = mpsc_stop_tx,
1610 .start_tx = mpsc_start_tx,
1611 .stop_rx = mpsc_stop_rx,
1612 .enable_ms = mpsc_enable_ms,
1613 .break_ctl = mpsc_break_ctl,
1614 .startup = mpsc_startup,
1615 .shutdown = mpsc_shutdown,
1616 .set_termios = mpsc_set_termios,
1617 .type = mpsc_type,
1618 .release_port = mpsc_release_port,
1619 .request_port = mpsc_request_port,
1620 .config_port = mpsc_config_port,
1621 .verify_port = mpsc_verify_port,
1622 };
1623
1624 /*
1625 ******************************************************************************
1626 *
1627 * Console Interface Routines
1628 *
1629 ******************************************************************************
1630 */
1631
1632 #ifdef CONFIG_SERIAL_MPSC_CONSOLE
1633 static void
1634 mpsc_console_write(struct console *co, const char *s, uint count)
1635 {
1636 struct mpsc_port_info *pi = &mpsc_ports[co->index];
1637 u8 *bp, *dp, add_cr = 0;
1638 int i;
1639 unsigned long iflags;
1640
1641 spin_lock_irqsave(&pi->tx_lock, iflags);
1642
1643 while (pi->txr_head != pi->txr_tail) {
1644 while (mpsc_sdma_tx_active(pi))
1645 udelay(100);
1646 mpsc_sdma_intr_ack(pi);
1647 mpsc_tx_intr(pi);
1648 }
1649
1650 while (mpsc_sdma_tx_active(pi))
1651 udelay(100);
1652
1653 while (count > 0) {
1654 bp = dp = pi->txb + (pi->txr_head * MPSC_TXBE_SIZE);
1655
1656 for (i = 0; i < MPSC_TXBE_SIZE; i++) {
1657 if (count == 0)
1658 break;
1659
1660 if (add_cr) {
1661 *(dp++) = '\r';
1662 add_cr = 0;
1663 }
1664 else {
1665 *(dp++) = *s;
1666
1667 if (*(s++) == '\n') { /* add '\r' after '\n' */
1668 add_cr = 1;
1669 count++;
1670 }
1671 }
1672
1673 count--;
1674 }
1675
1676 dma_cache_sync(pi->port.dev, (void *) bp, MPSC_TXBE_SIZE, DMA_BIDIRECTIONAL);
1677 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1678 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1679 flush_dcache_range((ulong)bp,
1680 (ulong)bp + MPSC_TXBE_SIZE);
1681 #endif
1682 mpsc_setup_tx_desc(pi, i, 0);
1683 pi->txr_head = (pi->txr_head + 1) & (MPSC_TXR_ENTRIES - 1);
1684 mpsc_sdma_start_tx(pi);
1685
1686 while (mpsc_sdma_tx_active(pi))
1687 udelay(100);
1688
1689 pi->txr_tail = (pi->txr_tail + 1) & (MPSC_TXR_ENTRIES - 1);
1690 }
1691
1692 spin_unlock_irqrestore(&pi->tx_lock, iflags);
1693 return;
1694 }
1695
1696 static int __init
1697 mpsc_console_setup(struct console *co, char *options)
1698 {
1699 struct mpsc_port_info *pi;
1700 int baud, bits, parity, flow;
1701
1702 pr_debug("mpsc_console_setup[%d]: options: %s\n", co->index, options);
1703
1704 if (co->index >= MPSC_NUM_CTLRS)
1705 co->index = 0;
1706
1707 pi = &mpsc_ports[co->index];
1708
1709 baud = pi->default_baud;
1710 bits = pi->default_bits;
1711 parity = pi->default_parity;
1712 flow = pi->default_flow;
1713
1714 if (!pi->port.ops)
1715 return -ENODEV;
1716
1717 spin_lock_init(&pi->port.lock); /* Temporary fix--copied from 8250.c */
1718
1719 if (options)
1720 uart_parse_options(options, &baud, &parity, &bits, &flow);
1721
1722 return uart_set_options(&pi->port, co, baud, parity, bits, flow);
1723 }
1724
1725 static struct console mpsc_console = {
1726 .name = MPSC_DEV_NAME,
1727 .write = mpsc_console_write,
1728 .device = uart_console_device,
1729 .setup = mpsc_console_setup,
1730 .flags = CON_PRINTBUFFER,
1731 .index = -1,
1732 .data = &mpsc_reg,
1733 };
1734
1735 static int __init
1736 mpsc_late_console_init(void)
1737 {
1738 pr_debug("mpsc_late_console_init: Enter\n");
1739
1740 if (!(mpsc_console.flags & CON_ENABLED))
1741 register_console(&mpsc_console);
1742 return 0;
1743 }
1744
1745 late_initcall(mpsc_late_console_init);
1746
1747 #define MPSC_CONSOLE &mpsc_console
1748 #else
1749 #define MPSC_CONSOLE NULL
1750 #endif
1751 /*
1752 ******************************************************************************
1753 *
1754 * Dummy Platform Driver to extract & map shared register regions
1755 *
1756 ******************************************************************************
1757 */
1758 static void
1759 mpsc_resource_err(char *s)
1760 {
1761 printk(KERN_WARNING "MPSC: Platform device resource error in %s\n", s);
1762 return;
1763 }
1764
1765 static int
1766 mpsc_shared_map_regs(struct platform_device *pd)
1767 {
1768 struct resource *r;
1769
1770 if ((r = platform_get_resource(pd, IORESOURCE_MEM,
1771 MPSC_ROUTING_BASE_ORDER)) && request_mem_region(r->start,
1772 MPSC_ROUTING_REG_BLOCK_SIZE, "mpsc_routing_regs")) {
1773
1774 mpsc_shared_regs.mpsc_routing_base = ioremap(r->start,
1775 MPSC_ROUTING_REG_BLOCK_SIZE);
1776 mpsc_shared_regs.mpsc_routing_base_p = r->start;
1777 }
1778 else {
1779 mpsc_resource_err("MPSC routing base");
1780 return -ENOMEM;
1781 }
1782
1783 if ((r = platform_get_resource(pd, IORESOURCE_MEM,
1784 MPSC_SDMA_INTR_BASE_ORDER)) && request_mem_region(r->start,
1785 MPSC_SDMA_INTR_REG_BLOCK_SIZE, "sdma_intr_regs")) {
1786
1787 mpsc_shared_regs.sdma_intr_base = ioremap(r->start,
1788 MPSC_SDMA_INTR_REG_BLOCK_SIZE);
1789 mpsc_shared_regs.sdma_intr_base_p = r->start;
1790 }
1791 else {
1792 iounmap(mpsc_shared_regs.mpsc_routing_base);
1793 release_mem_region(mpsc_shared_regs.mpsc_routing_base_p,
1794 MPSC_ROUTING_REG_BLOCK_SIZE);
1795 mpsc_resource_err("SDMA intr base");
1796 return -ENOMEM;
1797 }
1798
1799 return 0;
1800 }
1801
1802 static void
1803 mpsc_shared_unmap_regs(void)
1804 {
1805 if (!mpsc_shared_regs.mpsc_routing_base) {
1806 iounmap(mpsc_shared_regs.mpsc_routing_base);
1807 release_mem_region(mpsc_shared_regs.mpsc_routing_base_p,
1808 MPSC_ROUTING_REG_BLOCK_SIZE);
1809 }
1810 if (!mpsc_shared_regs.sdma_intr_base) {
1811 iounmap(mpsc_shared_regs.sdma_intr_base);
1812 release_mem_region(mpsc_shared_regs.sdma_intr_base_p,
1813 MPSC_SDMA_INTR_REG_BLOCK_SIZE);
1814 }
1815
1816 mpsc_shared_regs.mpsc_routing_base = NULL;
1817 mpsc_shared_regs.sdma_intr_base = NULL;
1818
1819 mpsc_shared_regs.mpsc_routing_base_p = 0;
1820 mpsc_shared_regs.sdma_intr_base_p = 0;
1821
1822 return;
1823 }
1824
1825 static int
1826 mpsc_shared_drv_probe(struct platform_device *dev)
1827 {
1828 struct mpsc_shared_pdata *pdata;
1829 int rc = -ENODEV;
1830
1831 if (dev->id == 0) {
1832 if (!(rc = mpsc_shared_map_regs(dev))) {
1833 pdata = (struct mpsc_shared_pdata *)dev->dev.platform_data;
1834
1835 mpsc_shared_regs.MPSC_MRR_m = pdata->mrr_val;
1836 mpsc_shared_regs.MPSC_RCRR_m= pdata->rcrr_val;
1837 mpsc_shared_regs.MPSC_TCRR_m= pdata->tcrr_val;
1838 mpsc_shared_regs.SDMA_INTR_CAUSE_m =
1839 pdata->intr_cause_val;
1840 mpsc_shared_regs.SDMA_INTR_MASK_m =
1841 pdata->intr_mask_val;
1842
1843 rc = 0;
1844 }
1845 }
1846
1847 return rc;
1848 }
1849
1850 static int
1851 mpsc_shared_drv_remove(struct platform_device *dev)
1852 {
1853 int rc = -ENODEV;
1854
1855 if (dev->id == 0) {
1856 mpsc_shared_unmap_regs();
1857 mpsc_shared_regs.MPSC_MRR_m = 0;
1858 mpsc_shared_regs.MPSC_RCRR_m = 0;
1859 mpsc_shared_regs.MPSC_TCRR_m = 0;
1860 mpsc_shared_regs.SDMA_INTR_CAUSE_m = 0;
1861 mpsc_shared_regs.SDMA_INTR_MASK_m = 0;
1862 rc = 0;
1863 }
1864
1865 return rc;
1866 }
1867
1868 static struct platform_driver mpsc_shared_driver = {
1869 .probe = mpsc_shared_drv_probe,
1870 .remove = mpsc_shared_drv_remove,
1871 .driver = {
1872 .name = MPSC_SHARED_NAME,
1873 },
1874 };
1875
1876 /*
1877 ******************************************************************************
1878 *
1879 * Driver Interface Routines
1880 *
1881 ******************************************************************************
1882 */
1883 static struct uart_driver mpsc_reg = {
1884 .owner = THIS_MODULE,
1885 .driver_name = MPSC_DRIVER_NAME,
1886 .dev_name = MPSC_DEV_NAME,
1887 .major = MPSC_MAJOR,
1888 .minor = MPSC_MINOR_START,
1889 .nr = MPSC_NUM_CTLRS,
1890 .cons = MPSC_CONSOLE,
1891 };
1892
1893 static int
1894 mpsc_drv_map_regs(struct mpsc_port_info *pi, struct platform_device *pd)
1895 {
1896 struct resource *r;
1897
1898 if ((r = platform_get_resource(pd, IORESOURCE_MEM, MPSC_BASE_ORDER)) &&
1899 request_mem_region(r->start, MPSC_REG_BLOCK_SIZE, "mpsc_regs")){
1900
1901 pi->mpsc_base = ioremap(r->start, MPSC_REG_BLOCK_SIZE);
1902 pi->mpsc_base_p = r->start;
1903 }
1904 else {
1905 mpsc_resource_err("MPSC base");
1906 return -ENOMEM;
1907 }
1908
1909 if ((r = platform_get_resource(pd, IORESOURCE_MEM,
1910 MPSC_SDMA_BASE_ORDER)) && request_mem_region(r->start,
1911 MPSC_SDMA_REG_BLOCK_SIZE, "sdma_regs")) {
1912
1913 pi->sdma_base = ioremap(r->start,MPSC_SDMA_REG_BLOCK_SIZE);
1914 pi->sdma_base_p = r->start;
1915 }
1916 else {
1917 mpsc_resource_err("SDMA base");
1918 if (pi->mpsc_base) {
1919 iounmap(pi->mpsc_base);
1920 pi->mpsc_base = NULL;
1921 }
1922 return -ENOMEM;
1923 }
1924
1925 if ((r = platform_get_resource(pd,IORESOURCE_MEM,MPSC_BRG_BASE_ORDER))
1926 && request_mem_region(r->start, MPSC_BRG_REG_BLOCK_SIZE,
1927 "brg_regs")) {
1928
1929 pi->brg_base = ioremap(r->start, MPSC_BRG_REG_BLOCK_SIZE);
1930 pi->brg_base_p = r->start;
1931 }
1932 else {
1933 mpsc_resource_err("BRG base");
1934 if (pi->mpsc_base) {
1935 iounmap(pi->mpsc_base);
1936 pi->mpsc_base = NULL;
1937 }
1938 if (pi->sdma_base) {
1939 iounmap(pi->sdma_base);
1940 pi->sdma_base = NULL;
1941 }
1942 return -ENOMEM;
1943 }
1944
1945 return 0;
1946 }
1947
1948 static void
1949 mpsc_drv_unmap_regs(struct mpsc_port_info *pi)
1950 {
1951 if (!pi->mpsc_base) {
1952 iounmap(pi->mpsc_base);
1953 release_mem_region(pi->mpsc_base_p, MPSC_REG_BLOCK_SIZE);
1954 }
1955 if (!pi->sdma_base) {
1956 iounmap(pi->sdma_base);
1957 release_mem_region(pi->sdma_base_p, MPSC_SDMA_REG_BLOCK_SIZE);
1958 }
1959 if (!pi->brg_base) {
1960 iounmap(pi->brg_base);
1961 release_mem_region(pi->brg_base_p, MPSC_BRG_REG_BLOCK_SIZE);
1962 }
1963
1964 pi->mpsc_base = NULL;
1965 pi->sdma_base = NULL;
1966 pi->brg_base = NULL;
1967
1968 pi->mpsc_base_p = 0;
1969 pi->sdma_base_p = 0;
1970 pi->brg_base_p = 0;
1971
1972 return;
1973 }
1974
1975 static void
1976 mpsc_drv_get_platform_data(struct mpsc_port_info *pi,
1977 struct platform_device *pd, int num)
1978 {
1979 struct mpsc_pdata *pdata;
1980
1981 pdata = (struct mpsc_pdata *)pd->dev.platform_data;
1982
1983 pi->port.uartclk = pdata->brg_clk_freq;
1984 pi->port.iotype = UPIO_MEM;
1985 pi->port.line = num;
1986 pi->port.type = PORT_MPSC;
1987 pi->port.fifosize = MPSC_TXBE_SIZE;
1988 pi->port.membase = pi->mpsc_base;
1989 pi->port.mapbase = (ulong)pi->mpsc_base;
1990 pi->port.ops = &mpsc_pops;
1991
1992 pi->mirror_regs = pdata->mirror_regs;
1993 pi->cache_mgmt = pdata->cache_mgmt;
1994 pi->brg_can_tune = pdata->brg_can_tune;
1995 pi->brg_clk_src = pdata->brg_clk_src;
1996 pi->mpsc_max_idle = pdata->max_idle;
1997 pi->default_baud = pdata->default_baud;
1998 pi->default_bits = pdata->default_bits;
1999 pi->default_parity = pdata->default_parity;
2000 pi->default_flow = pdata->default_flow;
2001
2002 /* Initial values of mirrored regs */
2003 pi->MPSC_CHR_1_m = pdata->chr_1_val;
2004 pi->MPSC_CHR_2_m = pdata->chr_2_val;
2005 pi->MPSC_CHR_10_m = pdata->chr_10_val;
2006 pi->MPSC_MPCR_m = pdata->mpcr_val;
2007 pi->BRG_BCR_m = pdata->bcr_val;
2008
2009 pi->shared_regs = &mpsc_shared_regs;
2010
2011 pi->port.irq = platform_get_irq(pd, 0);
2012
2013 return;
2014 }
2015
2016 static int
2017 mpsc_drv_probe(struct platform_device *dev)
2018 {
2019 struct mpsc_port_info *pi;
2020 int rc = -ENODEV;
2021
2022 pr_debug("mpsc_drv_probe: Adding MPSC %d\n", dev->id);
2023
2024 if (dev->id < MPSC_NUM_CTLRS) {
2025 pi = &mpsc_ports[dev->id];
2026
2027 if (!(rc = mpsc_drv_map_regs(pi, dev))) {
2028 mpsc_drv_get_platform_data(pi, dev, dev->id);
2029
2030 if (!(rc = mpsc_make_ready(pi))) {
2031 spin_lock_init(&pi->tx_lock);
2032 if (!(rc = uart_add_one_port(&mpsc_reg,
2033 &pi->port)))
2034 rc = 0;
2035 else {
2036 mpsc_release_port(
2037 (struct uart_port *)pi);
2038 mpsc_drv_unmap_regs(pi);
2039 }
2040 }
2041 else
2042 mpsc_drv_unmap_regs(pi);
2043 }
2044 }
2045
2046 return rc;
2047 }
2048
2049 static int
2050 mpsc_drv_remove(struct platform_device *dev)
2051 {
2052 pr_debug("mpsc_drv_exit: Removing MPSC %d\n", dev->id);
2053
2054 if (dev->id < MPSC_NUM_CTLRS) {
2055 uart_remove_one_port(&mpsc_reg, &mpsc_ports[dev->id].port);
2056 mpsc_release_port((struct uart_port *)&mpsc_ports[dev->id].port);
2057 mpsc_drv_unmap_regs(&mpsc_ports[dev->id]);
2058 return 0;
2059 }
2060 else
2061 return -ENODEV;
2062 }
2063
2064 static struct platform_driver mpsc_driver = {
2065 .probe = mpsc_drv_probe,
2066 .remove = mpsc_drv_remove,
2067 .driver = {
2068 .name = MPSC_CTLR_NAME,
2069 },
2070 };
2071
2072 static int __init
2073 mpsc_drv_init(void)
2074 {
2075 int rc;
2076
2077 printk(KERN_INFO "Serial: MPSC driver $Revision: 1.00 $\n");
2078
2079 memset(mpsc_ports, 0, sizeof(mpsc_ports));
2080 memset(&mpsc_shared_regs, 0, sizeof(mpsc_shared_regs));
2081
2082 if (!(rc = uart_register_driver(&mpsc_reg))) {
2083 if (!(rc = platform_driver_register(&mpsc_shared_driver))) {
2084 if ((rc = platform_driver_register(&mpsc_driver))) {
2085 platform_driver_unregister(&mpsc_shared_driver);
2086 uart_unregister_driver(&mpsc_reg);
2087 }
2088 }
2089 else
2090 uart_unregister_driver(&mpsc_reg);
2091 }
2092
2093 return rc;
2094
2095 }
2096
2097 static void __exit
2098 mpsc_drv_exit(void)
2099 {
2100 platform_driver_unregister(&mpsc_driver);
2101 platform_driver_unregister(&mpsc_shared_driver);
2102 uart_unregister_driver(&mpsc_reg);
2103 memset(mpsc_ports, 0, sizeof(mpsc_ports));
2104 memset(&mpsc_shared_regs, 0, sizeof(mpsc_shared_regs));
2105 return;
2106 }
2107
2108 module_init(mpsc_drv_init);
2109 module_exit(mpsc_drv_exit);
2110
2111 MODULE_AUTHOR("Mark A. Greer <mgreer@mvista.com>");
2112 MODULE_DESCRIPTION("Generic Marvell MPSC serial/UART driver $Revision: 1.00 $");
2113 MODULE_VERSION(MPSC_VERSION);
2114 MODULE_LICENSE("GPL");
2115 MODULE_ALIAS_CHARDEV_MAJOR(MPSC_MAJOR);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree